Water heater for stand boilers



' Jul 8, 1924. 1,500,327

L. s. LAWSON WATER HEATER FOR STAND BOILERS Filed Nov. 18, 1922 Fll'3.1-

Fit-L2- III I 4 9 l4 E /4 /N N70R MJTNESLSES Patented July 8, 1924.

UNITED. STATES LIN'DLEY S. LAWSON, F PITTSBURGH, PENNSYLVANIA..-

WATER HEATER FOR STAND BOILERS.

Application filed November 18, 1922. "Serial No. 601,928.

To all whom it may concern:

Be it know that I, LINDLEY SJLAWSON, a citizen of the UnitedStates, and a resident of Pittsburgh, in the county of Allegheny 6 and the State of Pennsyl Vania. have made a new and useful Invention in Water Heater for Stand Boilers, of which the following is a specification.

This invention relates to water heaters for use in connection with stand boilers and more particularly to means for maintaining a circulation of water therein.

An object of this invention is to produce a simple, inexpensive device for use in connection with water heaters for stand boilers by means of which a circulation of water through the heater coils and boiler may be maintained independent of the operation of the main burner of the water heater.

This, as well as other objects which will readily appear to those skilled in this particular art, I attain by means of the device described in the specification and illustrated in the drawings accompanying and forming part of this application.

In the drawings, Figure 1 is a view in pgrtial side elevation of a water heater emdying this invention; a portion of a stand boiler to which the water heater is applied 80 is also shown. Fig. 2 is a sectional view taken on line 2-2 of Fig. 1, looking upwardly in the direction of the arrows. Fig. 3 is a sectional view in elevation of the circulation burner forming part of the make-up of the device of; this invention and F-i 4 is an enlarged view in perspective of t e circulation burner shield.

The stand boiler 5 is of any suitable construction and to it heating coils 6 of a water heater are connected in the usual manner. The heating coils are suitably supported within a heater casing 7 and a main burner 8 preferabl of the rosette type is located within the heater casing below the heating coils. The stem 9 of burner 8 which is preferably a Bunsen burner extends through a drip pan 10 forming the bottom of housing 7. Piping 11 connects the main burner 8 with a sultable source of gas supply (not shown).

A thermostatic valve 12 of any suitable construction having its thermostatic tube extending-[into the.boiler 5 is employed for contro 'ng the flow of gas to the main burner 8. Pipe 13 connected to the high pressure side of thermostatic valve 12 is connected to a Bunsen burner 14 which serves as the circulation burner for the device. A hand-operated valve 15 controls the flow of gas to the circulation burner.

Burner 14 which, as before said, is of the Bunsen type is so formed and supported with relation to the lowest convolution 16 of circulation coil 6 that the flame issuing therefrom passes for an appreciable distance along the convolution 16. The burner 14 is provided witha screen or grid 17 and with a protruding semi-cylindrical hood or shield 18 which prevents moisture of condensation from interfering with the operation of the 7 circulation burner. A substantially U- shaped shield 19 as shown in Fig. 4 is preferably formed of cast iron and straddles a portion of convolution 16 of the circulating coil and the upper portion of the circulation burner. This shield prevents the flame from the circulation burner'from being deflected from its normal path or position in contact with the coil or convolution 16 thereof.

The flow of gas to the circulation burner will be so adjusted that a suflicient flame therefrom will be maintained at all times to insure a constantcirculation of water through heating coil 6 and the stand boiler 5.

Having thus described my invention, what I claim is 1. The combination with a stand boiler, of a heating coil connected thereto, a main burner below said coil, a guard or shield depending from said coil and a combined pilot light and circulation burner of the Bunsen type so located that the flame therefrom will be directed through said shield and in contact with the lowest convolution of said coil.

2. The combination with a stand boiler,- of a heating coil connected thereto, a main burner below said coil, a guard or shield depending from said coil and a pilot burner located between said coil and main burner and arranged to direct its flame along the lowest convolution of said coil within said shield.

3. In combination with a stand boiler, a heating coil connected thereto, a main burner below said coil, a substantially inverted U-shaped guard depending from said coil, {1 Bunsen burner serving as a pilot light and being located between said coil and the main burner and arranged to direct its flame along the lowest convolution of the coil within said shield.

4. The combination with a heating coil, of a main burner below said coil, a supplemental burner located between said coil and said main burner and provided with a semicylindrical hood extending beyond and H above the burner orifice.

In testimony whereof, I have hereunto subscribed my name this 16th day of N ovember, 1922.

LIN DLEY S. LAWSON. 

